<template>
  <div ref="wrapper">
    <slot></slot>
  </div>
</template>
<script>
  import BScroll from 'better-scroll'
 export default {
    props: {
       probeType: {
        type: Number,
        default: 1
      },
      click: {
        type: Boolean,
        default: true
      },
      data: {
        type: Array,
        default: null
      },
      listenScroll:{
        type:Boolean,
        default:false
      },
      refreshDelay: {
        type: Number,
        default: 20
      },
      pullup:{
        type:Boolean,
        default:false
      },
      beforeScroll:{
       type:Boolean,
        default:false 
      },
    },
   mounted() {
      setTimeout(() => {
        this._initScroll()
      }, this.refreshDelay)
    },
	methods:{
    // 初始化 滚动组件
		_initScroll() {
        if (!this.$refs.wrapper) {
          return
        };
        this.scroll = new BScroll(this.$refs.wrapper, {
          probeType: this.probeType,
          click: this.click
        })
        if(this.listenScroll){
          var that=this;
          this.scroll.on('scroll',(pos)=>{
            that.$emit('scroll',pos)
          })
        }
        if(this.pullup){
          this.scroll.on('scrollEnd',()=>{
            if(this.scroll.y<=(this.scroll.maxScrollY+50)){
              this.$emit('srcpollToEnd')
            }
          })
        };
       if (this.beforeScroll) {
          this.scroll.on('beforeScrollStart', () => {
            this.$emit('beforeScroll')
          })
        }
		},
		enable(){
			this.scroll&&this.scroll.enable()
		},
		disable(){
			this.scroll&&this.scroll.disable()
		},
		refresh(){
			this.scroll&&this.scroll.refresh()
		},
    scrollTo(){
      this.scroll&&this.scroll.scrollTo.apply(this.scroll,arguments)
    },
    scrollToElement(){
      this.scroll&&this.scroll.scrollToElement.apply(this.scroll,arguments)
    }
	},
    watch: {
      data() {
        setTimeout(() => {
          this.refresh()
        }, this.refreshDelay)
      }
    }
	}
</script>

<style rel="stylesheet" lang="less">
    
</style>